Polycations
(polycation 的复数) 聚阳离子
🗣️ 情景例句
Why were you out of work for so long?
你为何这么久没有工作？
It's none of my business,but I think you ought to work harder.
它是不关我的事，但是我认为你应该努力工作。
Because they destroy so many insects, and insects include some of the greatest enemies of the human race.
因为它们能消灭那么多的昆虫，其中包括一些人类的大敌，